Using the same technology as bomb or artillery
mines, the sub-munitions each consist of an ultra-
small actuator to orient the mic for maximum sensitvity,
a battery, possibly a
solar cell, and a relatively small radio transmitter.
the package or as a separate drop/launch
a pair of larger units with high precision GPS devices,
much more powerful transceivers.
During deployment, the submunitions are scattered over
large(ish) area, and they wait a while, then send a pulse
sequence so the larger units can triangulate them. After
the pulse, they go into listening mode. They transmit
sound back to the larger units, which analyze them for
human caused noise. Based on timing and localization of
the microphones, the devices should be able to pinpoint
individual noises. This information can then be
transmitted back to headquarters.
This is primarily intended to operate as a rapid
search and rescue aid during major disasters such as
earthquakes or avalanches that leave a large number of
people trapped below the surface. In these cases, the
would be scattered fairly densely in order to gain the
They might also be viable for sea or land based searches
for lost individuals, although clean-up would be difficult.
In that case, a wider scatter could be used, since the
individuals are typically going to be more able to
In addition, each mic might have a small audio circuit
instructs anyone who can hear it to yell out.
Ideally in almost any SAR application, these would have
be deployed before human searchers got into the area,
hence the rapid deployment from fighter or bomber
aircraft, which should be able to reach any disaster area
a very short period of time.
Finally, of course, they could have military applications
tracking the movement of enemy forces.